/Engine/Plugins/Runtime/GameplayAbilities/Source/GameplayAbilities/Public/GameplayEffectTypes.h
Get the modifier evaluation channel to use
Either the channel directly specified within the settings, if valid, or Channel0 in the event of a game not using modifier channels or in the case of an invalid channel being specified within the settings
[EGameplayModEvaluationChannel](API\Plugins\GameplayAbilities\EGameplayModEvaluationChannel) GetEvaluationChannel() const